Detailed Instructions: In this task, you're given a context passage, followed by a question that needs to be answered. Based on the paragraph, you must write unambiguous answers to the questions and your answer must refer to a specific phrase from the paragraph. If multiple answers seem to exist, write the answer that is the most plausible.
Q: I fell down on my driveway this morning and scraped my knee. It hurt, and it was bleeding a little bit. I went into my bathroom and carefully washed my knee with soap and water. I pat the area dry with a towel. I knew it would be very important to keep the area clean so it would not get infected. Therefore, I applied the antibiotic ointment I keep in my bathroom drawer to the scrape on my knee. I used a cotton swab instead of my fingers, so I wouldn't get the sticky ointment everywhere. I then decided to put a band aid on, to help keep germs out. I tore the plastic backings off the sticky part and placed the band aid on top of my wound, over the ointment. It gently pressed my fingers on the band aid's edges to make sure it would stay in place. After that, my knee felt much better. 
Question: How long did they wait after getting hurt before applying the band aid?
A:
Immediately